I'm a vegetarian who also eats some environmentally friendly seafood. But most importantly, I eat organic and locally grown foods whenever possible. It is both for health reasons and for preserving the environment.
I don't prefer to fill my body with antibiotics, pesticides, steroids, and growth hormones - my body is my temple, and I treat it as such.
Supporting local farmers is important to me, which is not only good for the local economy and better for the environment, there is evidence that eating locally grown food strengthens your immune system.
My nutrition choices are for my health, not to lose weight.